SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5280929086b02c32fbdf7b5e2fe725dbe333ed3a2e9f42dc0c07a6a0213c3868' 
  AND token = 'rbal6Lq3b5+MHGMY/OwBvVSXjGksJa7DW61xwVlUvwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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