The 69-year-old former diplomat had been widely expected to extend his rule over the oil-rich nation by seven years and get a strong mandate to continue his increasingly independent foreign policy, as the former Soviet republic navigates the Russia-Ukraine crisis.
Voter turnout stood at 69.44%, with five other candidates scoring in the low single digits, data showed. The second most popular option picked by voters was "against everyone", with 5.8% of ballots, Reuters reported.
Several fellow central Asian leaders congratulated Tokayev on Monday morning before the preliminary results were announced, as exit polls published earlier showed similar figures.