SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf3ece430b6e051bf86903dc9161701654668d83af46837b51c47dd6cab751c' 
  AND token = 'fKdbLDt1FoTNV0qVBWJo62Ffd/08CvdgWoSvH+cR5ps=' 
  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