SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c3de237002349b8ce8e83860f71b69c0849a454cfee5d5271e0965b485ea4d' 
  AND token = 'qt2hX35EFg5fY6UXhdvi1dWBijmw20JamGRzICc2hDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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