SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096e0423726695cd676ca961f2b3531944bd63ff279ed05f1eac8a88eb5ede77' 
  AND token = 'vtqL65lWa3uYugQWWRVhiUyB9t3MZ1mgJKrhe/xzrow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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