SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e80d33f77c17e039bcc486ddf912846fc101fa8bbf5125e68392af9f46ae0c3' 
  AND token = 'Z5cvmEBElkUHXCpHyraFAwSW+Mh1zJzfqDkSuCn0GEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}