SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd90756ed94050310392c53c9074ff19163fbced5ec1b2b902a28639f6542c2' 
  AND token = 'T0wJ/7uar9JDZvTrRPuiCVpYeasWqWxbz9AmKncEekk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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