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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a0a6d9c46497073876ce1ea3d4158fa1193217b6231e78286839293cfe3e6c' 
  AND token = 'sdVRt4IV5SRlIeS9bIOAnUZEosbd2NeJBvLqyMyRoRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables