SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f664fada86c7fa9d8ee3c0d20673e1d390d17fa16eb69a20c21467505e0dfaa1' 
  AND token = 'l2TI7LQF+D08KOty2bgsYDSJO31lTBHNPrRM096MyLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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