SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f6dc5059c64163bf00ff47a24a6a66c0be4f0f87b6e1395f11367a0975fc8d' 
  AND token = 'j5GMHalUFhhW82+WNoRZnyK4IqP/Ra2rJEzUVsuzYOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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