SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06856d50b56bff5f511baff81f5a99139b6cc06b56f5b0db96a278b14833657' 
  AND token = 'Jeof6aaYRt5RBIv5vL6BYSiANSX8xLzgkTRl7UMEDWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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