SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7929438199f60a961a3854702a52cae26d1db5790f8b50208eb4b98b59551b9d' 
  AND token = 'pui7mYghjyHokMh2VdiRKRQvg43Vmu0+vJBm/VxnG9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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