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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02034c1ec8a4dd5c3a52679065dd672d0d94c5b17cf4cb9696332b50706374e3' 
  AND token = 'YqLjP5lZPzEdQeTaendjo5jQQVVIBiP5QkhPWFkN18I=' 
  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