SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae6245ce4f03c7ce6782db42876d5c8209a42586ad63b94d8f920df54cb617f' 
  AND token = 'j9jboHHYm9r6K936FmkyTYD+z5x/h3eI7/P/hmXAq/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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