SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf476a35e7e7227cd49dd63cd2c86d0471989a4c8b166b8b82635c350636ce3' 
  AND token = 'gwvKlZXdqKo4+nwHSVPrNqUf7MsHlafEDO3IwLfFWV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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