SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47df84178917b9dd7bd69273a68d328be7f956bdb1e52e93ed73abd7602d739f' 
  AND token = 'V44choHof8bz1EVQTuWOS/rVcz9ECNSAuXE2XU4Ydoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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