SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0735323984314a92e373acf881c53db7f386db8f4526f26d51b2fc9c7e1265cb' 
  AND token = 'Ltq6UpBodw9WKxWsOJtwcgsxvgy8Cf3Mo7kmBivazBY=' 
  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