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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8104fbe70ee78065403211a031f0cf9493fd582041fa4f304626c5b5534590' 
  AND token = 'LnJ6XAdKBDPz6Rvs+VmPVak03CaBc0HonEflMA+HxJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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