SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1c84ea306f784733b4842343bbad1252c33005283c268535ff9ec3d93619fa' 
  AND token = '5rLeewRo5utSlupexN35Z+RF2xJhLMQErxP3KXib6Do=' 
  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