SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08fefcebf69fbc3a99e0351cffefc0b8b50a04b270fb9a4ce54a0ca329457e2' 
  AND token = 'G+QqGYFQiZ9cEGGmEqw2vufU+ehSu5p2cpCrrfwmi/I=' 
  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