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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2074a4aaa1362c3a4f433eac58ed245d6d4b18aaabc6d027e857a29b1883ba4' 
  AND token = 'TJMf2AFlcojxsF3jsGLU12HstUNJ6pIvZJoFrQPJefM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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