SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707cdccbb4206771e0acdfdc4b04a826ff1e443a485329c35e57fb0c607205ef' 
  AND token = 'MqVTzBhGSHBylTgiXX8Zvunnp2mFA+ZcwRmNApauLU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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