SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fb14887292745d05a45acd41bc05691dd0e917e4b1cd0d1bd006b8f3344c06' 
  AND token = 'AO0Mt8s9N6XCcSGlL7johXECjcH9a7C+yuApVFMeGEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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