SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d2a2a2ca9304313c9c8fca87729213a0e0aff1481a0d4f64351f9e1f1edabf' 
  AND token = 'VKzPFpY1R+zFPGYNQju2t57VlImbRAjUZJsH8j9KuIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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