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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b835702adb1c75c6570e373cd9796d3eaf35556731d3ecb8e66c074289befc8c' 
  AND token = 'w8RGIvC4nC7r8BxBhlf83S7SOHALzaF1rBW3bjo905Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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