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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c96b65588e83b8eb3f215302198dd761d04cd4c1842ca14a2e6d229a87ceae' 
  AND token = 'cONf/SOomuXS8NbiA75DWrYXSeLjnNBfOy4ZrQW9sKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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