SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed989bd60b76384e38127dc02b331fd8e5e5e593e7f7420a4be1d38045cf1a4f' 
  AND token = 'AmFc1Ff8fhhVlBfU8sow9uE/HYVsCkW/UCTR3prEEYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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