SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ba15dcf55e5490d8d835d41cb0851e8abd3e7a6957565d02ad864055709ef' 
  AND token = '7/Ihy/br1F8koniFbFCp02zh769qeGELHWsKvZXhNIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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