SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c752d166ee03e2d3d8f7553288835631ab02ede6b20790012c5a69c5981ab01' 
  AND token = 'gpDm/zSPORQXUTzgejk2jlUXzSu9MotiE6HzKRpN9Ro=' 
  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