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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1967b4257b05aa4ce62b92129ce6ade5b7642fc2df637301dcca717ed70ab1' 
  AND token = 'WaRcEcDn7GRjOjX9YjiuF9CWPPQxqcxOdZxz00zwd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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