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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e93eee52377963d8014a997fa93ad39a587b52bcc31090d9d2efe024eff54f' 
  AND token = 'duDeVYXw0oMCjgxxki37RKbdq3CbxnyKLuDWGLCJTmg=' 
  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