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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3f531628d7272ec27742e006a835def0734c02023f2ada074b240cabe54ec9' 
  AND token = 'jU7C6zRQMHTpvmQfU8fzlW1dOGpNOcC1ku4VjFzrVEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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