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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a2876c970d41690730a38054c29c7e4262c8399859e4cd6414f95326804057' 
  AND token = 'SFNmAw4V6W32HHUeR3Ds8CihwBi5JW4QULcT5oX//fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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