SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fccd5a7671606fb114e875f826e05a19870ac858ccc22b4017c20a10b6de135' 
  AND token = 'EnAvmX5/5fnSoh7YWOtLtdC8D9J3KjJm4Ji3GM3K/0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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