SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eab1c525306f613ff8de99b6f345e379116c7a8e38bd195862d2a76dec21367' 
  AND token = 'Rwv3ApG3ztfcsRkkPB8uv4TwzXVDqQ/HuvRPQIgpoQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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