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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08f1cab1d9f493d52d0449a4969924e5e69ac7c6836217cd7e1339ffeaacb6d' 
  AND token = 'EIM9358qEc6lc4ZaAZLYfJb66hw/sTI/9ESH/I+H3UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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