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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fee706f31d4bb573fadfa045f86c8cd087dee7c9f079a435b98314fe1dd2dc' 
  AND token = 'aI8pISPRlhl3nxcctuP0ooy9Rw1bE0WaUHbftMjdcvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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