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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097a39df456036a9077e2c48086f52edf1d9ef173bdc2497972c8ea3efef9dba' 
  AND token = '0nZXn2uwidZEPg1EHROObLjYYfASPbVKysj1XxMio5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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