SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf429165afeebbe4f4d8c7739a62b295f2f03bc70caa7e72a4a8a3a49f491f22' 
  AND token = 'VYJGV00hKXhnForP8n5XXEUtn0qHwRLzzCiDEKVwpOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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