SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f05abf87faa3c5bd320c67abe55d331262e9375a17c15a85c9f53ef84c837c' 
  AND token = '65WKB4iWGOavtxf7KBZClmaS6LMlUzmpZ4FqPe/tDX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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