SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f509df4bb4698c5a0789373d076e2e8d1806dbdc75152a2a0f4bbaa7a9e7a8' 
  AND token = 'WX4beGs+AnwTTXTC+EgNFC839v4oQC5Pzj7f+QSmtbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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