SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d67ef0573d23f015bdfcfab0e46a8b922d6c289f6ff6994d4754445b6d7ca7d' 
  AND token = 'TXHdYAJ8v2Iisu+2h1gCMXtzGXVGxoyjZIlaH51UHXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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