SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a671619369a09d11e56ee3040a9694b23993b71e7c1d15ed46a1966eb8b0f8d' 
  AND token = 'iRJwi7JPG6p/d1sqawDbNrfxMrcCOalkLjAqZn5rQd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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