SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cb3920f81577730525c13373f4c477c7663c412d7ecc4dad0ca27e8b97def9' 
  AND token = '4Ff/6zAHcXKQvm6+BDVqoJqflERtY8blbdhP1wAo478=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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