SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73041bffea57d3718394bb2c62a291e780cd348c35bc8e7f1838d37160c099a4' 
  AND token = 'TsuGsPMG+CqnbA0cUVbNrcKQQGyWbFzGb8uaqa6AwWc=' 
  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