SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9528bcc6997269fba64eff7ed13f1a21389e4c404ffc88bb610c19f184dfc3e4' 
  AND token = 'LGAZGt4RrcpDBpvFEO/ngUCw8vjHG3/YRkg2nM7Nl0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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