SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e85e1c0ef9ac84f479edd9ef1ff9dbf7a847105c4c29d9666d590b5ac76372' 
  AND token = 'MvlqArTUf25+CSvINchvfC/HoaDBl1qxDgYgPYLwfzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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