Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8199d1aad34d1b1811722e42a892e6b411db2cfc391628954c8c074607da431e' 
  AND token = 'Kis9ryHKjjbcYF5VUcDCbJgudpNdebqt7u6v4O4roTE=' 
  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