SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2b3473384b0a0319384fdcdfd5e761bddfc94f504fddb7ed9f89fb882505dc' 
  AND token = 'M10N3C0S/2ehwP/VvMUIqWQWvMWYN7wuuL/NIU4Mwuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables