SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d57956d0e41b1b9b7a9800d6d7c97b81cf4fc59d118ac368c06ef0bc515226e' 
  AND token = 'wN7NZLvEUbLebhtrH52+ST+UhqWV3Q2ZFZgJzTY+o3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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