SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d658ff829a07749da731d4c6cd54860b5f9fff4fe7099e83ac7a943b1530331' 
  AND token = 'kVeziv5hBAzQcU+BIaj3JLC4TgXP3S+4SXJmyQdqBn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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