SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952166d9a67bb9f3a697fb053c8d616113076f244f9aa7c827bb5bd2fe4e00bd' 
  AND token = '2QjHGYjE5cmvPcFtDFud1+Jsfj1y/ZtcfosLhymNryE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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