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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a30816b2a86daf77aa20d4480a1171626ed0f870933d8088cdf63302385495' 
  AND token = 'FfvZbTefz5U8eLqcbmJ6VcvHkJojNLMZTdtX0nZNl1I=' 
  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