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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbb7d9762b74affd2ad780eeec7ca29177d3ccf2317df97e50e373b394562e6' 
  AND token = 'D4KPw68wwZPmF6Kr2Xh9GZWkEC6rpYh3v4suNaYy5Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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