SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a37cfa6c1db791feb6fb6e7854183aba8f9d08e4492bca784c77e6910cf9bc4' 
  AND token = 'D5cS9xu+1snL+WT69zCOlKEhRg1TjiCjQiTwvrLI2nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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