SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f7139a4808a124557ca4fce79e437c0d00aa3f77f163acef5aabc8e2d93e3c' 
  AND token = 'aku/6Y29+q5UEjiuklAnup5a524aYD4lBqRCLwwtXVM=' 
  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