SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce72745765fa8963a7c5d60a71e3d907c55e1b21fbdbeccadf65a3aea40f7be' 
  AND token = 'iXxE5MBT9y6Nul23pdDgiSsvs7YsUKY/nmUgD8vdUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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