SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d574a9bb4dc04fa0ba15b38d75942e180fa8733f5d1674ec8801a2ab90a650' 
  AND token = 'M/hbI/0MXn0Aj6ueL07gPbx/y8c7rKtqm5oHddGWxiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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