SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e265c4b73f4376f0a44599a047afab22a3864faeb82693c34e17388c0a95a0ac' 
  AND token = 'mDTVve//6MV3EZSsg5KcGRyE9crfC7mmtkct9MmSS3w=' 
  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