SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09646f403e7e0266596d2a4fe272bd95c00f7a0d5647848a204fd7c2ea6ffa82' 
  AND token = 'CmDWyYl5utZ9ZbENXWXmPlO61gTu8QG9idhahRAcF+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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