SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a9c5cd2e6d4f3450cf82a72cabe861df50588b000fe98397718fd65d39cfac' 
  AND token = 'g3yHG4d9ZmqGFg+PHlJPUIFwhb/6qBkpAMCU9KO2O64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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