SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34784fd87914df9464938bc2629eb6b5e9197dc867631e8700b0a820003c9fe3' 
  AND token = 'h1vXhTtXu1BWfvs/3cgkrCunqJopcZ4YmJZhW8YMJHI=' 
  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