SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be599bc4de66d70c319c01f110c22927362cb83d007afa87b278c36825f4a88b' 
  AND token = 'Sjamoc1p2mS5LeFXQiXOele+OVlq5QP77P3idHGqSkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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