SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69da6a1483f6d40a883279fa415312b7324514959fab1d714d9fd8b0b901196e' 
  AND token = 'hhNufJU6D8q3cqdgyJ/RzK6LSqKCrrGZtbCqMBPuPvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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