SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b06c9b102c15888ea820ad5932ab0d7fe41048bc093e7c06385ad35cc50604' 
  AND token = 'qBs2ebY9NPLFS06NwyI0VY4owsNRcCp6S5+pqsZ1WaI=' 
  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