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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef93973a384ebe988408e0be9c434b154212c28101c14a303be7c181d519eec' 
  AND token = 'g+JGymYap1U6a9uVYhb8dUWKD0xv8U/3dWj9iPYlWhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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