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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85db4b49f74e44975dfdbf819f38e28e0b2a5be5bf4d58082d48fc176b57665c' 
  AND token = '7p8FbZmFG3h82koN68JeiZRSoDa11HeldSRuUGLVd2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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