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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2139aef83ede685f0eff097c1d356441caae8501ae3914cbfbec18d175c00049' 
  AND token = 'tMYWb5W91PnVoVx+OkljeX5P4gkvbvA31ZQNu+6y6v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}