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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2bd16ade61f2e64a0364e816e7efc9b9d9a0e69f635f552e97538872679343' 
  AND token = 'P4ORsaA9yvaHzUublFZToCxTPiSIYQNv0fZ98tN6EDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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