SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa07934c641031457a5330743fb0fb6bc94d7e36fa9621c958ea167355b89aab' 
  AND token = 'tZcpaGoJVFgRJn3xmC8Kw+HVZd7xsu3s72B7zMPv4kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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