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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9898b45856f003fd68139fc11190f97ca20da971c3eecc084d002718517ec1d1' 
  AND token = 'UaZlgrIXF44I0AMGDOpoIs3Swr0QOMCyg7JA98mhmjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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