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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cdb3ea186a93345b6fb0bd51a3168825eaedc27ece3de74d1739cb0362009a' 
  AND token = 'FG4ZZphAExclPlSc2JkAq9ulKXskASShdHx90BPPH3w=' 
  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