SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c911dd95676e001036cacc3db1ba0fd37a1d05c52e570ae036850866227922' 
  AND token = 'I6SauT1QuQkBpsfzHw+qsnJEP7Th+DY0jTBAT2Jz/a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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