SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364b5d156304b574eb2d3c6460a50bbf4a765fc7ab38697194adf263c08697b3' 
  AND token = 'HR2rn8rFO6OM4QpWeVrACdq9+anWljm1oBMj24YGGvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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