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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a42cc1a5d06c07c83c7ceb77ee62201b0cf270fb930dfab929bfdfbe885217' 
  AND token = '7p0ZuzwWQtOMDDdl9NNIbcIlRimJMXpNwaLSJGac8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00962

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