SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f27ae2dcfc9fb2bba7d349151995b8b9df908758c5a533ab11b744d31ff56f' 
  AND token = 'zwWgU6r605RVJs1uHbsvHXv/SoD1/+9uazgy/1e/+Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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