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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db6889fffa3017794570afafb441f89e20b22f8d290b0a417dc7bfbf1fa10c9' 
  AND token = 'YYcEoo2fcAfTp5ZxSErSwzhIAX777kc6WWF4nk9U25M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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