SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a87a59beffcea41c96a74184f1fd1645b727608faccd88dcab8dbc9dc276030' 
  AND token = 'pCG8hNzMjDLjHCRJsYglQw+IMlI7nK2Gv0uOjK4/8BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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