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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d09ee55a5d22b89afc47f6a2c3f8ec2939bb54ce2fdf8c59283e610e4e19516' 
  AND token = '9Gbzwaw2fQGGlDl3T8mRuzde2YbbWVY4aX6sWMObmSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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