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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e29d36b59118a1558c7380d95a007ebcce9ca1274d5ca78f8d02f4c0a83a50' 
  AND token = 'lZ/3OVgyd9Sy1ryVt0oZig4f61hw0jFo3WIHnf+OKTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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