Place crackers on a plate. Pour simple syrup onto another plate. Dip rims of glasses into simple syrup, then into crackers.
In a cocktail shaker, muddle mint and lime juice. Fill shaker with ice and add rum, cream, and simple syrup. Vigorously shake until outside of shaker is very frosty, about 20 seconds.
Fill glasses with ice and strain mojito into prepared glasses. Garnish with more mint and a Key lime round.
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2023/05/03/key-lime-mojitos/