SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bfd3540cbb0d28a7eeadacf86bce06294fd11df1b4d68dfc5c1188e023dbab' 
  AND token = '/xpVWPjcPfnUoZgl+zDH7wwdUapK/72lMCbbsAxSGY8=' 
  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