SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc70d50a8c2ae745ffe6efd102aaa138300cf92ef0f9842bb5d16848d63d1189' 
  AND token = '+T6R4z1jkQxKsZD/MNpY1ITFICmr5cYrGC/lz53wnjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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