SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955e456d6ca5e7fd998c7c08a893a151f01de78012f65f49eba2faf1d28b0281' 
  AND token = 'hP+rDTzZh9nNN7gD6S+fIztTKBdZ9I6DVwfYegzVB80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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