SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaa05bb3a5fd966bfa20b2037503e59f7e73cf4809a611c434e92e9e3c199db' 
  AND token = 'KXHLIqH2V7aHB/zx5n+ChfZJy3DUH6TnzAJOdtVvRd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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