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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc7afadfa3f849fd540dd5456f276317cfc7e94c57016b44071940f83ab3cd8' 
  AND token = 'NSMuYoBMauyXfYGQTWWi3wffW16hJTH+lfB2Y1w8V64=' 
  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