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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5c73bab05d4038fa6ea69dd2d2c52dad1eff9c05c0b448f457b1148687211b' 
  AND token = 'zdrZW0rdqSiw/aaL5hmSuxxj7TsaVEZETwoxJWq5/fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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