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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aa41a70fa54a69bd13308d22126f8a7847fe80d7c80fee9ccc44c1339bf3f0' 
  AND token = 'GjAQVRcJjwEZgn315sP3ss15JkCP2i32AWW7icvHgYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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