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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6b2fe60d92cc6a72ce4f6474c439ebee205327527f46dbd050c7863b0790d7' 
  AND token = 'iOGm007n7vL3KvihpzDVNnPsl6N8oP9MunFeJSqQBKI=' 
  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