SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922965842fff7b9748bf8eed025290026780dd7d1a152341201400b890023b1d' 
  AND token = 'ui+zm54AJHn3PaGha3ko6FWrCGsSWwrwU3Jshq2SVKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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