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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2b7983f1ffda2b4ed99d0e8e611a1710c6d99bfdbc3940132685896371c03e' 
  AND token = '3Q6qJ9twDceiFgGngM3gINU8ssg3nU7vcToSVwFe65w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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