Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f04f19840f967a21b42a9bd7081cd71a5f00397cd1cfc164d798eefa7df052' 
  AND token = 'MOvOZIVDruETygwrF28uyRbjb6yF0qN7RLgbYz1Y0c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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