SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cc2620ed5c2b97a2a97deac03fc58e24c971f8e0d4713362fe7534c8e7bd49' 
  AND token = 'v+SPW4hzF2PXcTTEQv7GnH9XCujBq7lUoXUWUC6NhLs=' 
  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