SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a828bdf9e1b20feac25be4a7d6305acde51ce9fc58bcbb63c202f3a402f36db' 
  AND token = 'iATn/4bYLDbx9e8aGiK4bf1eMOWGJI100y8fClWRjts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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