SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d62454a72b9468bd67abc4b59fc921adf9b75f34a33e2f3cdd86a9383d9fd7' 
  AND token = 'ZQdZ1lKhgZUCFrgjxEtoUofwtlszyz2jE4681fm5vjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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