SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae82bcacec0247d54edfcad3ca3b6802087703baf5c27fdbb993c4e1ff4854aa' 
  AND token = 'jd4sagv89/xH1pV8uwk0EWF372SrtYsrkO2r6XCD9Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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