SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea403860862ef41c7aa416ca98179045aa60add9138e7fc06ac488dbbc2e910d' 
  AND token = '+DWwoCHFykhx/uMJSLMlyqiPUsJ5/DjALK2v25hFJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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