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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1f3a8a11f3020d470f37565d50c05e448c6ce9fdc6c3b952de1407e0373916' 
  AND token = 'cNzdgq8M5W1JNKKrl93ZPe4PkuKzDGXdu3yoEcn1XeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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