SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c842acef48b080539c1c87c72ae90382bc822d9822ca6aaabe8ecb53880b38f' 
  AND token = 'lMgC/fZLVky7QD/joqBkA9K1e/QgbwrDMosle/qIIAw=' 
  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