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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d39b2d39ee07b2822a2ad69d640f4e78474ac3053def972d1152c29dcec83d' 
  AND token = '26b8V9gnsdmqffAFixzZn/0dnc5tggFVf+uLCFvnwK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}