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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbd72fd73d11bb892affc73711a775a3aba1f71892e044685b4ae316c1be941' 
  AND token = '/7Io2PLErXsYLsNJKKN76OaGj9CrsS8QCh8lrXjN4rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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