SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5f664d07cfb0e40c421a4f8da4ea6769ce3cc40d7181eb249df0e6f83e19eb' 
  AND token = 'lOdSTPHYbHQoCILnb47oTLwsO1s8y1semKIsaEV7RyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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