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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cfe5db433c7e0688480b3e120fbc682df1d5056dae58c274642d4c1923529f' 
  AND token = 'sni64T7Twb2Td9JSnUVjDusJxWcNwPSHTRR5A5fr4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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