SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8c608c79bf5cad2bd6f914b981e5c2fe08a97db184d8903bd6e65b3fc1259d' 
  AND token = 'sO9NSsJNJpVoNIm4zfGwO0KBt/DP2qa+iPlcdr5al3Q=' 
  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