SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab72e8fc550b50a65dbb671616a17f9c6a28d39472d0477da856a951146626f' 
  AND token = 'o++6x4iMr94XN0ygzWJJSjHOltNR2O8sQFI7bImBLX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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