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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4f3d97dfc1fa1ac2dcb166fc7f7d2ea30d1769d79f6aed2cb17dafa93341b4' 
  AND token = 'IWfEhQ3hmrc8hzo1bY3Ullnq7taVMYxhf2IlUaEJyM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

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