SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1564d70add88b6957e397b883003525cd471e1f661f542aba9ce5b9ac7ecfa' 
  AND token = '/R7Xu78Wp+RUTj56JQX80CRaz2piN4Iebq+UISDWTHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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