usepackage[backend=biber, style=authoryear, maxnames=2]{biblatex}

@article{1testing,
  title={Title 1},
  author={Zanthony1 and rrAnthony2 and Anthony3},
  journal={Journal 1},
  volume={24},
  number={2},
  pages={258--300},
  year={1992},
  publisher={Springer}
}

@article{2testing,
  title={Title 2},
  author={Zanthony1 and rrAnthony2 and Anthony3},
  journal={Journal 2},
  volume={24},
  number={2},
  pages={200--264},
  year={1992},
  publisher={Springer}
}

The standard verb=cite= command produces the following output: cite{1testing}.

et.al.