SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7a93c0340c62d1560f3a0e71756cb7e054df262b50dbf454d550ea6de15ad6' 
  AND token = '98GtFJRLh0i7RvNV7+U1eIzcTggNUbxicdczJqZ2XTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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