SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d2a2f776618564f7e32ab3c9751385b119ed097079f8c5ed025b35f6f54468' 
  AND token = 'j5eTMxZg2LClT+3OrPjP5oN/XEJqo/w3m++HbVUQGus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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