SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33bcf27702ecec62d7a5fb2af86383e04a0300a86c1fc7f379ad2372ec11d87' 
  AND token = '01Pc54sy9Apgt1Fkm40wQqdxZPjUnAvmOxjRmRBBaNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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