SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd9a6800f02ee0701ce110019ef629ee9cb0132a29402752112f098f0f6a8dd' 
  AND token = 'lhAcd0f+zxsyECKGqH+0lM5+A/Jvhmf/KwQc+9eeRlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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