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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f6b02ca10cfbc05cafff14871d4aa1d84880c7844db1636e80790a94bdf531' 
  AND token = '69ZZLC4TUOdMKdbIDIrMCU8BiCQtdbpR50QlkgQsPKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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