SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7208540a677103c2ddc06430e42859233b6bd64220401fd0e48abd5142a0fa6' 
  AND token = 'GwWzFDPmUWtkWVHw4jnn55PpNSnptgaLd+z8JHvZ15E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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