SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed485eedc656b5e90f2d2373a7f4cdc2c84c08284ead69425e9709d33051464' 
  AND token = 'Xs3vZWjb3ONhmr+sVKKz5KWYmlvgC3unbz9Rp4i4l+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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