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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044393d8db88fce34751a9758ae8dafa604049da46fbe26ad1996adba768d34d' 
  AND token = '9+Elo6mvX2g312P01IrgT4PHboGeK+xSJFLyIQUN32Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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