SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4930494be71dfca5cea9c81b243a50fd70149c70e7e4b193523f5e2c905a63' 
  AND token = 'U/F5G2zP5ZQgbl2WSEZhbxgAMtqZqFRnZ6Qjxs85xDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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