SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee0ff80d6178bbc0b2eaff86fad96b8ecf291d6636b9924addfd44e651dfc8a' 
  AND token = '7Xxjhl3KNHEwtHQhxcO4zv71xGUon+9Igj6qjgUsG2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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