Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d63954f1fdeb7ab409df0a571632cecc0c09fd6a3d303646baa59ecaca8338' 
  AND token = 'v3zI614wpFg10t0jPbm1WGJscq3uG2evQZK4LPcEsjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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