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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af8151ff2ef482fbe319c36d3d7d863c3557e7acec1cc7c63bb00863440a821' 
  AND token = '7UqX5Tx8IoXZLeWscZ8GxTWjwEcYURqGMy7syW6FzVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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