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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5fe7e3788c5248026ab40021d586edd3b00d8cdff5243b33e1665000d689e9' 
  AND token = 'dr749nXaT7OMURFyxmERoIvVLQ11xZOdZhlT3sLN0x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

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