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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9ced919ed500f590c9b76c83042e594fcdcf4d5c7cff587e538f65e7410032' 
  AND token = 'dR+4yct1IXjE5PM76QFKFl85brCJ+qw9jKAZm99Yo7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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