You can navigate through a set of keyframes using the Previous Keyframe and Next Keyframe buttons in the Tool Options located on the right side of the tool UI, Player controls tool bar, or by using the contextual navigation menu in any Animation Editor.

When using the Next Keyframe and Previous Keyframe buttons in the Tool Options, keyframe navigation is restricted to the keyframes set for that particular tool. However, when using the keyframe navigation controls in either the Player controls or Animation tab Property Area, you can navigate through keyframes of all marked tools attached to the dependency graph.