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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac6003c99893fa75decf86b0e65c82f8fec864fb99d9f4ad4c91e09b0cc5a37' 
  AND token = 'kmQetX/w2lNsizPM7rNwplXFVPruCdLHxFh2DvRJjMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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