SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cac6e173ee2b9115d4e657a8fc895b27780f69f4848ad15da7a7788ea6dd0b' 
  AND token = 'HRl34bM/mxO0gt19jG2x+uBnpbIJnQ9j/xYbj60NJ8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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