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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127910be0be10a60dc11671d9f4d076824272f2eb638f88c92f63d364525d5cf' 
  AND token = '7JNU6Pfgk4G1UivjWHXKKRoZSHytN0Pyf17FinAo7Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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