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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4a72f905aa22ad73b409ea62d37b9962b1ac44c608d18714813276b60b3498' 
  AND token = 'wrwf7OZFl5FjM6IvMsXqepTBK21AxkvaaWuCP8Megyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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