SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d48c886e391b30d518ce719c88478db7e9cd87bf2418d9deef7a84bab6b3e9' 
  AND token = 'xyRiwBGhyW3pc2krUVdKch+/KrbNGgs1XjifGLqdEmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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