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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfa175a1b5b023d888470e0103852224356a20e242d74edc98242e268a4feab' 
  AND token = 'HLlp3GGKYAWhlMT3MUS+GSIDC/tV1HMI/ADr9SLHK8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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