SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420e4fec0541d60b9ec3731d639307705b9b4253acd11f7969e8f960b2bdc5da' 
  AND token = 'oOvDE9KVJaMsoZ/g4LYpjPfJlFR52KDT+U0JeRQFv3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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