SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcebf511a15c93e53a6b4d9273d79c637ee4f723fabc86a98fee977e7d7fcfbf' 
  AND token = '9/oE/zpo0PkYWxgHggImHUhv0JLcplS6B2qr8DuTMhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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