SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5671f1e6cbe6565dfed3a768638697075ec2bceae63f03565694dabee2737427' 
  AND token = 'ytJJ8jVk4iDnO9s5pk/DJK0Mrj0iDYynOj6ifsPdj/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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