SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cfed3cc05e02d951f9d0828ab313fed0f62b37947241d33918ff874ff63917' 
  AND token = 'q0PYJV5uWrNgFdF6j2znYslCWoKOm4x9TSfIxYgNUug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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