SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b888ee59fdfbd652979a4184f24ce629db2f0a0a4cab84cb3f9e6aa30d889c' 
  AND token = 'W5+/TXWm0NlyzBsT2ciCUipVPgCze4VuQd7dC02Hrlk=' 
  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