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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cea2eded1ff5df4d50d40c434d6947ce59a896a413daa7842d0dce5d54580bb' 
  AND token = '3NYJvhaxkwrCUJ1A7lWHPNHWZl4CFZ3PipPuF0fmKNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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