I finally create a rasterized eps file with sufficent quality for my needs without losing the ticks. Maybe can be helpful even for other file formats outputs.
Try this double rasterization, where you can increase the ImageResolution value, but I do not recomend to increase the RasterSize beyond 515 or the ticks will disappear:
myPlot
Rasterize[%, "Graphics", RasterSize -> 500];
Rasterize[%, "Graphics", ImageResolution -> 300]350]
Export["myPlot.eps", %]