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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f3743a70af89184047524024e10b9500d14da19e118e2adf22a1cd7acb5431' 
  AND token = 'v4ODu8HdwThjcZ1WYxqMjEQCq4RRxkUYQ30zpwaU1Sc=' 
  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