SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96589545691f88ab408f15ba2175dd3c1e947f7b01af568838bbad60f7755af1' 
  AND token = 'fyTKaYV7eaiC8VtHvJED/s46yaSOVnRDq1vBzfO7kWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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