SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7439ff269ed38b5b23883671df06db482ecfc5eb7c12e100628bb92c6a3d5c9' 
  AND token = 'e8IxFS+CEqVq7iQTB7VOhGiP8wvCS+YW3UR6Mj8oSTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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