SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2ec7efbff2d66f62d22a334c7b9c4ec72fb8abc499b5cfc068837d7b07240a' 
  AND token = '+9NNLxJaHC4AmkETlP0wy4c6HDp9Tqy/4xu2KZE9BV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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