SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e00393980b408e16fffb9d608a8e586c808d63c5656fd7fc848a1c6a3839e3' 
  AND token = 'ehZ5Ch4c7V4oSVfy/q/nTrBm+2OrKZJoTJSMqDvHBtI=' 
  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