SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cb2bd8b27f44a64879a740c9b95539b9c08984eb3a6ceb400dfa843ccf2e19' 
  AND token = 'ge373Kd9FmFdQTeKY+04r6ios87qKoKcaAaqfyQ8bFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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