SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b16f80c473e1f04dfacaec99cba496b0fffb95cd0a3485ac1f7c893603c4dd3' 
  AND token = 'HqEbcMFOJYLP/2arvNuBwogJsHn08k+AWUz/K+BaUU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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