SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92fe09709fc3e88db06e6861bbce7322d768b9247a4c8f5c162cee87a732050' 
  AND token = 'rdA6mrUSaJuBtkB+vesEs7l+vTJlGS+LijO4XGaxRM4=' 
  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