SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89928e77fe9977864c8fcf8c34c8537c8e9f26da0f0cce02c69392f9db024327' 
  AND token = 'Lx/zgdJkjKKvOQbEBOVQlVp3B3wp7DTSQe4OjE0nD3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables