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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd085104441a9ac384a9b3ed8d6dcf4253174c7632a17a6db1b66bc7e8ecb84da' 
  AND token = 'K5pdd14Q7klHXX47PU1SobhE5MrhFj18PY5BIo0HaTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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