SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c63280996540cf443ca681c9473f720c1b9ca1d7e44667bd2f255ab25f4e023' 
  AND token = 'Kz+YZNutxXXq8q+rzjkmpvsmj6IFpkdlJ0N4EjSygI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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