SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b604f2b08892481557ff8dd224a6edb4ba865227d35a3415a88ce933776e57' 
  AND token = 'Vpgzs4cJaCqECDohAhGuglCn7NSZFGG/2BT/hRiosjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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