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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5d5c0d9c50714d4a6dfd4a0c212d59eaddb6f8f7c57019dd77b18ab56a4f0f' 
  AND token = '9Ng04m/76EpjzYt/I1+W4qUoI5hu0tyW0UAl3M0059Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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