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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6405bd91c6acd3a21b418f99d3642356695d39dab53001359ddb8cd06db9e5' 
  AND token = 'baCp9UjRw06YHieXFsqMw+/VD71EM6+Pa7r1gAxgeEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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