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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24b27b5910a7bee7dcfeeb42206810a455c9b6fd476a4fe3d08f204ff0f9d2b' 
  AND token = '+iKoq5DEaIv0Znwj8247WjV3ZSo8jlj155k0LSbNnMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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