SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199023bbb078bab179757af730320644e08184006e125a475856aab6c5d71af2' 
  AND token = 'EwUMTDEFZpFmlCQolEGTKBTGuhiwVOLgj5ah+U1rJJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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