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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c75b14b7dfff0e1db08772d0b7418e8a6db5fded784eebd4a0df7b4d11a069' 
  AND token = 'tz1Hj21kwf0FCi1yPrhRnHqZXtPhrdhV5d9sSCKo0qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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