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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f291c6f2bd212e7f919634288483d100d45fa24c56ed48bf9c40d66b54278c7b' 
  AND token = '6gcBLhzSRTIBdQkIME4gqv8FtLDcdjTq8M0cIaBECEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

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