SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e07c0a62c11eda793bfa2ef2798c48fe1c192c94b3895cb5c78a81d5f41a4f' 
  AND token = 'd9Wf25JWdI9akHzoyJ6YHYzt29G/n3rFqsQyF6qqHMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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