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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a51ad1fd25eea0f2efe3811d2ce848f80d6173d139df8f24e4f555815f56a1' 
  AND token = 'XUuRy85FeGudxxxnlY3K9etqktjo0enLRqmw1vBqZng=' 
  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