SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4028deb12dda68af64921963427db18625094cbfeaf7c41c35713f4b3b59de3a' 
  AND token = 'Ds4MxxqX5vrShT5cGLOWqSh1mItDk1B/Wjg6g6l9WZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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