SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0edb028e0f6fa2ca851555a941d4f04e2a8af27c19a95590f3db15dd794f33' 
  AND token = 'HOD0cHloO+1RVI/xGqA7RU3vjpfsX9B+XVFhAnJ1oHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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