SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb5f62a75a1181334a338ab0f96c2362bd7514e167f4a5b5dfae8d4cfdc0f04' 
  AND token = 'aWLiBquU1L8vAdHBmtuljGORoN6/E19wb/uVjNhMwcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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