Which word means what here?
since there is no Al in front of the word "key", you must presume it goes with the "a" article.
هناك - there is
مفتاح - key
Here = هناك
There is I would translate as = يوجد
מפתח // مِفْتاح
How would you say, "There's the key!", eg, if you've been looking for it? Would you simply add the article to "key"?