SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7699a59a7f7a06034f664ad8baa17454da2b8213bf457e98b3e49762926f6a84' 
  AND token = 'oT02+VvoGCLex6oNFHWutkcMUZxjzliUe5BwAhCl/UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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