SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa21216567ba623ca96c202b823c86ef00a8f6cceb8742dfc453210b33700128' 
  AND token = 'jcEWBG+WKHPOH5egVMKwG4MGnJZpjphYgPhMAMOPnOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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