SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29382eaf6c8b123add582924d2cc5331d437af052a73adf81a7fdf5cda058bf' 
  AND token = 'HDAxt9pqcL5qmAHwzIOoerV5MkHWaMfcYXu4ca/tAj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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