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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e59eb9df3f59c8411d27f1a1927d899f2a8f1668c69d75d20c2b3de58b787eb' 
  AND token = 'PmdsNh741JxLWga35gWiinzHP6tK7voclg6DiVOTYmE=' 
  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