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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d313a8e47da53340fdda8f2e8cc77beccf740b47d3900a4a96adb9b83eef6d' 
  AND token = 'Xtdaw0xliUnbclTSeme5aEf4TEoHdr+QN9+twY6LzjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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