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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1491220173e471e438d1f4cb57be08e9d11a9d349162a49e142fe8cba5bdaf' 
  AND token = 'Wfg17uC9MqU/vkUe4T/XSBQx8fAKvh81NRX4r+DBEMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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