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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca249dc07e9a12a71c5d63e38eb8e32c28001db71e780d5bcab5b619d29618e' 
  AND token = 'VEtprrGxV2zX6NnbxQQAxOLlfPt6WtHYaOnN6Cm5Udc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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