SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24390098a71b9810aac56760e95b9ba64af36d820b6a6a8f07e3509a41c75a8a' 
  AND token = 'z76LgqbD3nphV+bYvYLqK3GjjLbg5v8cuVuiL+wWD14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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