SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5f3dccf95473aeeb8f57a94faf42234812aa6b6d8a289a4bcc1992363992dc' 
  AND token = 'sgQeANTSTmHM69n7qOUdz9FSjVJomVvgWvIzaLhoq/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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