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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe546e937d8dfb4d50acec4abb1caac726c2e7f4a7b1e917080a88c2242aea8b' 
  AND token = '5lhvu1JeMSWAo6wCCRKniXF1hwwJHkOZemy6Gg5nNCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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