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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054af9833058a97f8469a087168381da98812d65e84c4a8863b65ed287ff182b' 
  AND token = 'Vm1o/MrRu+2+/fDbFtTaLbwArnmvHgj0jQKIdU4R2vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

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