SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc290715344c3debc5c079df27e7368f76efb4efbfef1f68a3717ccca02c3ef' 
  AND token = 'dQk+MwJZbHe1n8VfWrJfHjfOykEsvrj4DhCdYNHH+oo=' 
  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