SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac85b8c14942493b11d0b3eae84259c59b5b509cf2c311bb7938c03335a405a' 
  AND token = 'KUMIAIM2rMB7wuwZCEOL+fxiApGwP4DjUNZkcrGJEVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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