SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466ddd30204f7b9b891fdc25964378bb9286b1da0fc090f3d9e3281282663663' 
  AND token = 'j834l8wHzjF0jGE1CVKu3zn9th7FrRuChBdlr/LdgKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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