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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab80fc45514f82055bbf4e1054d4da9ed0dcb96756557d707fcc7d6fd1b6552' 
  AND token = 'UjRk4Mxyr7195j/j+u322/0KV55/l6j+/JJwlTZOwns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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