SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d7ba72f44822891f26816cf7e541335de06aeb9988d27a4a7e278f2778fae9' 
  AND token = 'wsljGUidqhDYItBb6YJ95hyHWY+uK52C7OaYrnrWjQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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