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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a0babd4e532b6282ee921edf647dcf4157230c968b95e65c6344d6715851b5' 
  AND token = 'dIsKJupVCzLba6qB3TUwbMIjyeXuZuJ9WF7b38RYTeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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