SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b55b6a8dd220af2972b64826c20f58f68131616c238e02a1539f499764503e' 
  AND token = '3HZtpIdv822EBOLg3hD8aXTJTGuvizcKxgqY6tk8TuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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