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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8603047f5eb46ca0edc11a6026dd74cb0b86d3cb891626a15c2e45d77356d01a' 
  AND token = 'rEviDowMa458brRJa7NDLpSuoxm3U9mFr23LmNEsJyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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