SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa7411df10b8078719c5426a4a6380b7233d44a6734e42d0be413f6225b784d' 
  AND token = 'pJCVbapVKM7s4UGZ/jnYCGa5Bz0zt9dAlWhrSO2L76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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