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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09a99d55843e8236519f02eda3820dc843bd1633ff3a8fd1bb3bf55dd9e437d' 
  AND token = '3TQfEQhSQPnmo+JNpvUTscuJmZmpGchm3eOIINwzbrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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