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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7134439e5b2ea1ac2ab243beff3650d6aa2ddf2812c4f1f05f49e13122e8a092' 
  AND token = 'L34zxtE9vVo7TVC6GpFcIjYGc1dU3+60yeRzcwLA2FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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