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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6660ce4b1dbc0b34952e7d52bc4d72a617cc25b4238e70e495e073e4d70e6bb3' 
  AND token = 'Pu7pnuDB92P9kqbfeltCLFOaICtLt0txJgXaAOUhax8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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