SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b3143d58cf9efae9650c24199a5f3227c8b1ef19b5adf5f6ee72ae1dace174' 
  AND token = 'lKZjIdvk3HFOCHyIbegiXe7PzMBfqefZ7pB9n/nPnII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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