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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3bdde51435dc55f5d18c0a1a843555d7a7df6c4484c43c8b02bd099c5f08778' 
  AND token = 'bzRviQ4fU0g0ScKT0yNQfvrAVnk6nWnneM6usyxWAdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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