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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3e6b48f9262586a6e679bac3cdd3a8655e253d0ed24ddd466bd8facc0bc790' 
  AND token = 'xUNDq4hF9N8h347QvHXpIgGbWPdYkVV35EY1HS4iDUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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