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In Wireless Sensor Networks (WSNs), most of the existing key management schemes, establish shared keys for all pairs of neighbor sensor nodes without considering the communication between these nodes. When the number of sensor nodes in WSNs is increased then each sensor node is to be loaded with bulky amount of keys. In WSNs a sensor node may communicate with a small set of neighbor sensor nodes. Based on this fact, in this paper, an energy efficient Traffic-Aware Key Management (TKM) scheme is developed for WSNs, which only establishes shared keys for active sensors which participate in direct communication. The proposed scheme offers an efficient Re-keying mechanism to broadcast keys without the need for retransmission or acknowledgements. Numerical results show that proposed key management scheme achieves high connectivity. In the simulation experiments, the proposed key management scheme is applied for different routing protocols. The performance evaluation shows that proposed scheme gives stronger resilence, low energy consumption and lesser end to end delay.