SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d90a48e1ce2fe22fbfe3d3ad961ed97dd7c83ac949ab81b1b8486afc20e932' 
  AND token = 'c4mOyO/N49MvceC8LI8oRJIdINr6AbXzA141+F8Ir4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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