SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da15eb8bb919430fcfd6717866c4c5b898296501c6d07067f8c462aefea7b60' 
  AND token = 'BkWbUKwpzGgCSCuYgv8m39rwSXX9PGBQsaxWR530JDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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