SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c201677545ff4bd336208a2a8d8d0483d145ad0c6460fccfa3bc3b117b37e8' 
  AND token = 'NQzxWUnz+h3hGucYwXOLFk8TWXZkjH4btlA4N4mjIr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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