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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87bdb9885e3b5d4d899ddb491732b13c1fb50bd71e45c5ba9d3add1a86b5767' 
  AND token = 'uIrSm5LYOtx8xiKSJqbE3qlf336yYocfA89grzWYzOs=' 
  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