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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddb65fe516288e393c641111d4845fcf67f911bf77803bdcb190b2b750b6192' 
  AND token = 'C5DDhFr8VG1PDh5YvEWMu4PpAEnYrf21NJYbiH4krIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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