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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eddabb1d87ce709b2f0838d8849db80cefd435f98b6d904d8cb8707e49a4cb0' 
  AND token = 'uT1TWgVLaI39wt2ffHxfqsoJZCXkSfXA5YvEiG2FQhQ=' 
  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