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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8f6b79d13f9d4a4ccbbbd0cba1293c1c7a44ed2720076ea32da548866f68af' 
  AND token = 'C91cqnuFu3ABpro6XoJ0q2ukYIBaw2MywX3il0RLQZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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