SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832b46cbf140b461a9d368e92a687ec377c4345101a5ab6e05407c97f36beaaf' 
  AND token = 'EnGK9B1smZbrXTzOvOKrhYVWzqB1hMvZjem63LYcHgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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