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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a3a47d307035667330f9bb09150d153bfb05efc5f6cb5a2249d1ec09092393' 
  AND token = 'wXrx6PDgnU66G+3j6FN3D9enEvFwTZEJ0UkEnemXx9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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