SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d4c46f36e640505bab55ca3139245e56164f0c48f796dbe088573803fdf6ac' 
  AND token = 'gTNIGN5wE9QA2XCdicA+HO9hIqFTgn/tBh+we7GfJdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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