SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a92641ec478e9114ded8124259ef53633ca07d1049765ab7617a329f615626' 
  AND token = 'sLtE4TqpzTSAZJEmPym53G//l+a36ImcRu+KJSN0qYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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