SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8129b56a2c4e1417b56a890e360ef4d2f04842d9571188d2614d775d15a37095' 
  AND token = 'Jvi5nHQbw0kSfsWsDnZHJ/OfkIyQ7kyqGSQx2ZCWX70=' 
  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