SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1155c845e2a729af91e1bf1c4e88a148447ae2c8ae1a4919888797ca99449d' 
  AND token = 'UMAJOHaUry0/0lrfSSmJGYHdSuKXEybAu/n0L/dshXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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