SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f075b7aba68364188c4ce5fb3196e1f7c7321ac37975a9428bc895d171c3163' 
  AND token = 'rWES9nvjma4gq9Lx/ejsVzL2X+Ra5WXUHdosJDMU1Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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