SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa64f99997ee3dd9e8666ab7df46d923585505d4a77adc10613e7e0143283597' 
  AND token = 'YOKgwbbDDJcfZAPpeaxtwVB04KhHC6AYU1yzV9NQ/Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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