SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c299e8e6a4f5ca675d33f8df73bd57c9a4bfcbf75a1ffec33809ab4d4278595' 
  AND token = 'HEwq8U2mtgsg8AWnDJFCaXfuV6HVhL2gpSJMjTKMqeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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