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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18f3ddff8b38fb3b1f44fb0c3ca072323a8dbba6e341d50cd2ac3db885f92b2' 
  AND token = 'DyRGJxBW7M4RGCGFiSOzH0PWL59JPSh8OTlOHROytGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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