SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf277501f3d6d8a63c5e4a156b72c96c3bad3ba4d0e678962e193ada70baea0' 
  AND token = 'Mf/BnxZ9xcvGisJI40MJuCcGHH5V3I6z+hFVD77hjt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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