SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4e33533931c89a9ea4c1273b14f38a0a7ca1eb93bbe2073a054f606c5628ff' 
  AND token = '0N0ltHuyHQRtwnXHlkqRm0orVtE+z7fHnuRJOGAQ9sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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