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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61f2a2394792a27dc28d374b7f58e622e91903e0dc223c1262452a470988c7a' 
  AND token = 'ISlydpPA5YVhZurszot2OuNaAbabh290nCAW03C2VC4=' 
  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